Abstract:

We miniaturize all features in a previously introduced
polarization-independent three-dimensional carpet invisibility cloak by
more than a factor of 2. This leads to operation wavelengths in the
visible. The structures are characterized by electron and optical
microscopy. In contrast to our previous work at IR wavelengths, we can
directly measure two-dimensional images at visible frequencies, perform
control experiments from the backside, and compare the images with
theory. We find excellent agreement. Furthermore, we study the
wavelength dependence in the range from 900 nm down to 500 nm. Cloaking
action deteriorates as the woodpile stop band at around 575 nm is
approached.

last change:
2011-08-12 KIT – The Research University in the Helmholtz Association